Toy building block



FIG. 1 is a front, left side perspective view of a toy building block, showing our new design;

FIG. 2 is a front, bottom perspective view thereof;

FIG. 3 is a rear, left side perspective view thereof;

FIG. 4 is a rear, right side perspective view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a left side elevational view thereof;

FIG. 8 is a right side elevational view thereof;

FIG. 9 is a top plan view thereof; and,

FIG. 10 is a bottom plan view thereof. 

CLAIM We claim the ornamental design for a toy building block, as shown and described. 